Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What makes the cells of the muscles contract? – ...

The flow of water within a muscle fiber may dictate how quickly muscle can contract, according to a University of Michigan study. Nearly all animals use muscle to move, and it's been known for a long ...

Add Yahoo as a preferred source to see more of our stories on Google. Muscles are amazing. They're what let you strum a guitar, kick a soccer ball and high-five your friends. When you decide to move, ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Kiki Crawford, USC Dornsife College of Letters, Arts and Sciences (THE CONVERSATION) ...